// 测试文件上传修复
// 文件：test-upload-fix.js

/**
 * 模拟前端文件上传流程
 */
function simulateFileUpload() {
  console.log('🚀 开始测试文件上传修复\n');
  
  // 模拟中文文件名文件
  const testFiles = [
    { name: '微信图片_2025-08-21_151615_908.png', type: 'image/png' },
    { name: '公司组织架构库安装.pdf', type: 'application/pdf' },
    { name: '测试文档.docx', type: 'application/vnd.openxmlformats-officedocument.wordprocessingml.document' }
  ];
  
  console.log('=== 测试文件列表 ===');
  testFiles.forEach((file, index) => {
    console.log(`${index + 1}. ${file.name} (${file.type})`);
  });
  
  console.log('\n=== 前端编码流程 ===');
  testFiles.forEach(file => {
    const hasChinese = /[\u4e00-\u9fa5]/.test(file.name);
    if (hasChinese) {
      const encodedName = encodeURIComponent(file.name);
      console.log(`中文文件名: ${file.name}`);
      console.log(`编码后: ${encodedName}`);
      console.log(`扩展名: ${getFileExtension(file.name)}`);
      console.log('---');
    } else {
      console.log(`英文文件名: ${file.name} (无需编码)`);
      console.log(`扩展名: ${getFileExtension(file.name)}`);
      console.log('---');
    }
  });
  
  console.log('\n=== 后端处理流程 ===');
  testFiles.forEach(file => {
    const hasChinese = /[\u4e00-\u9fa5]/.test(file.name);
    let originalName = file.name;
    
    if (hasChinese) {
      // 模拟前端编码
      const encodedName = encodeURIComponent(file.name);
      console.log(`接收编码文件名: ${encodedName}`);
      
      // 模拟后端解码
      try {
        originalName = decodeURIComponent(encodedName);
        console.log(`解码成功: ${originalName}`);
      } catch (error) {
        console.log(`解码失败: ${error.message}`);
      }
    }
    
    // 模拟文件名生成
    const uniqueSuffix = Date.now() + '-' + Math.round(Math.random() * 1E9);
    const ext = getFileExtension(originalName) || getExtensionFromMimeType(file.type);
    const filename = `file-${uniqueSuffix}${ext}`;
    
    console.log(`生成文件名: ${filename}`);
    console.log(`原始文件名: ${originalName}`);
    console.log(`MIME类型: ${file.type}`);
    console.log('---');
  });
}

/**
 * 获取文件扩展名
 */
function getFileExtension(filename) {
  if (!filename || !filename.includes('.')) return '';
  return filename.substring(filename.lastIndexOf('.'));
}

/**
 * 根据MIME类型推断扩展名
 */
function getExtensionFromMimeType(mimeType) {
  const mimeToExt = {
    'image/jpeg': '.jpg',
    'image/png': '.png',
    'image/gpif': '.gif',
    'image/webp': '.webp',
    'application/pdf': '.pdf',
    'application/msword': '.doc',
    'application/vnd.openxmlformats-officedocument.wordprocessingml.document': '.docx',
    'text/plain': '.txt',
    'text/markdown': '.md',
    'application/json': '.json',
    'application/xml': '.xml'
  };
  
  return mimeToExt[mimeType] || '';
}

/**
 * 验证修复结果
 */
function validateFix() {
  console.log('\n=== 修复验证 ===');
  
  const testCases = [
    {
      input: '微信图片_2025-08-21_151615_908.png',
      expectedExt: '.png',
      description: '中文PNG图片'
    },
    {
      input: '公司组织架构库安装.pdf',
      expectedExt: '.pdf',
      description: '中文PDF文档'
    },
    {
      input: 'test-document.docx',
      expectedExt: '.docx',
      description: '英文Word文档'
    }
  ];
  
  let allPassed = true;
  
  testCases.forEach(testCase => {
    const ext = getFileExtension(testCase.input);
    const hasExt = ext === testCase.expectedExt;
    
    console.log(`${testCase.description}:`);
    console.log(`  文件名: ${testCase.input}`);
    console.log(`  扩展名: ${ext} ${hasExt ? '✅' : '❌'}`);
    console.log(`  期望: ${testCase.expectedExt}`);
    
    if (!hasExt) {
      allPassed = false;
    }
    console.log('---');
  });
  
  if (allPassed) {
    console.log('🎉 所有测试通过！文件扩展名处理正常');
  } else {
    console.log('❌ 部分测试失败，需要进一步修复');
  }
}

// 运行测试
if (require.main === module) {
  simulateFileUpload();
  validateFix();
}

module.exports = {
  simulateFileUpload,
  validateFix,
  getFileExtension,
  getExtensionFromMimeType
};
